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Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1978 71
1979 83
1980 165
1981 148
1982 196
1983 167
1984 159
1985 169
1986 161
1987 186
1988 210
1989 169
1990 228
1991 211
1992 326
1993 362
1994 317
1995 316
1996 337
1997 419
1998 522
1999 526
2000 500
2001 477
2002 500
2003 753
2004 672
2005 627
2006 640
2007 863
2008 682
2009 719
2010 672
2011 695
2012 722
2013 956
2014 677
2015 551
2016 541
2017 455
2018 528
2019 540
2020 654
2021 392
Text availability
Article attribute
Article type
Publication date

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18,019 results
Results by year
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